A Butane Recharger for Your Cellphone

We live in a miraculous age in which we can carry computers around in our backpacks, pockets, and pocketbooks. But portable devices are only as good as the power within them, and as they get more powerful, they need more and more power.

Battery technologies keep getting better but still aren’t better enough for 14-hour flights over the Pacific or watching the Olympics all day on a cellphone.

For decades, we’ve dickered with fuel cells, mostly based around portable proton exchange membranes [PEMs]. But even the military, which has been more interested in portability than anyone, doesn’t use them much.

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